Apparently Harry Styles has a thing for dropping trou…whether it's his or someone else's.

Weeks after dropping his pants on stage at a One Direction concert, the boy bander played a prank on Piers Morgan during a charity soccer tournament Monday, pulling down the former CNN host's pants and exposing his underwear underneath.

After he successfully pulled off the prank, Styles ran off, throwing his fist in the air and laughing, while Morgan quickly pulled his pants back up.

Morgan took his underwear exposure in stride though, even getting in on the fun later on Twitter, retweeting a Vine video that captured the moment.

The One Direction singer was on hand to support Morgan and his bandmate's Niall Horan's charity football challenge, which raised money for Irish Autism Auction, a national information service for families affected by autism.

Rather than let his hair down (literally) for the event, Styles pulled half of his locks up into a tiny top knot, similar to the ‘do he rocked at a recent golf game.

"Have to say, in all seriousness, that @NiallOfficial did a fantastic job today raising a lot of cash for @IrishAutism - proud of you, mate," Morgan later tweeted about the tournament.

As for who won the match-up, Morgan got his revenge when he beat Horan's team, which included Styles.